Telephone-muffler.



F. W. COOK.

, TELEPHONE MUFFLER.

APPLICATION FILED 1 (AR.12, 1910.

I Patented Apr. 25, 1911.

awueutoz 5291] B 500/1 F. W. 000K.

' TELEPHONE MUFFLER. APPLICATION FILED MAR. 12, 1910.

990,527. Patented 11111.25, 1911.

2 SHBETSr-SKEET 2 au-uewtw hunter-Hawa ians I 7mm it- 1. 'tzri/ conccr-n it lniow nrthat 1, Final) Coon, a citizen of the United States, residing at Beni a H13 hef couiity'pf Denver and State e; i'nv'cnted new and useful in Telephone-Mufilers, of

ving "s a specification.

ention provides a device to k N U nsinitter of telephones for lo cbiitinmg the sou'nd' and prei 'enting any one pin closeproxi nitv to the instrument from c ernal sound'so that the iiictnessirovides an article of the t a which may be detach- 5110137 fitted to tlie'a 'erage telephone transmitandavhich m y be conveniently carried aie pipekler sotl taperson using a public 1 i '1 cut any one from'dearntr H on. ructionand combination or'pamg h eh. I nafter will be more particularly setf th; illustrated in the accompanying drawings, and .pointed out in the appended claims.

. Referrin'gto tl e drawings, forming a part of the app ication, Figure 1 is a central longitudinalsection of a mutiier for telephonetransmitters embodying the invention. Fig. 2 is a. front view thereof. Fig. 3 is a rear view of the attachment. Fig. 4 is a View similar to Fig. 1 of a modification in which the mutiier is constructed to be collapsed.

40 Fig. 5 is a view of the modification in collapsed form and shown applied to the transmitter of a telephone. Corresponding and like parts are referred to in the following description. and indicated in all the views of the drawings, by the same reference characters.

The muffler comprises inner' and outer shells 1. and 2, which are spaced apart and of tapered form in their length, a mouth-piece 3- at the smaller end of the body, and a plate 4' at the larger end of the body, the shells 1 and 2 being connected at their ends to the parts 3 and 4 in any substantial way.

The mouthpiece 3 may be of any construction to insure a close fit between the lips of the. person using the instrument and the v ion of the person send-' me mess'ag 'and at the same .nt tthe ommunicationmayhear the.

the" message transi-nitterhl .where booths are not an consists of the novel fea- Specification of Letters Pa e, Patented Apr. 25, .1911. I Application filed m rch 12, 1910. Serial N6. 543559.

fering with clear and distinct transmission.

In the event ofthc moi'ith-piece 3 beingconstructed of Solid material. such ascelluloid, yulcamte. metal or the like, it is preferred to provide the outer edge with a. rubber binding 5',.which is yieldable, therebyinsuring a close fit between the lips of a person using the instrument and the mouthpiece.

The back slate t may be of metalor other rigid material and isprov-ided with a 'centrally disposed opening to receive thehead of the transmitter. A collar 5 is secured to the baclr plate 4 and extends forwardly therefrom in lineavith the opening and is provided atits lforward'end with an inner flange 6 designed to engage the frontlof the telephone headand limit the rearward movement of the. attachment when placed in position thereon.

Spring clips 7 are secured to the back portion of the attachment for retaining the same upon the telephone when the attach ment-is placed in proper position thereon. The spring clips 7 may be of anyconstruction-and attached to the back portion of the device in any manner. As shown the spring clips are substantially of L-form and their inner ends are secured by rivets to the an nular flange 6. i

It is to be understood that the parts are to be covered so as to prevent injury to the instrument when placing. the attachment in position or removing it therefrom.

The shells 1 and 2 are spaced apart so as to inclose an air space, thereby preventing external noise being transmitted to the interior spaceand interfering with distinct articulation when using the attachment during transmission of a'lnessage.

The outer portion of the back plate t is perforated. as indicated at 8, and the rear port-ion of the inner shelll is perforated, as shown at 9', thereby providing for respiration when using the device so that it will not I the shells 1 and 2 extended a helical spring 10 is located in the space formed between the shells and may be connected at its ends to respectively the mouth-piece '3 and the -plate4. The spring 10 is of conical form to approximate the tapered shape of the body of the device. Spring catches 11 extend forwardly from theflange 6 and are adapted to engage the mouth-piece 3 and hold the device in collapsed form, as indicated most clearly in Fig. 5. The catches 11 preferably form a part of the spring clips 7.

The attachment acts in the capacity of .a mufiler to confine the sound when transmitting a message and also serves to cut ofiexternal noise and prevent confusion in the reception of a communication,thereby facilitating both the transmitting of a communication and the receiving of the same. In the construction shown in Fig. l the shells 1 and 2 are of relatively rigidmaterial, such as sheet metal, thereby resulting in the provision of an attachment or muffler having a rigid body, whereas in the construction shown in Figs. 4; and 5 the shells 1 and 2 being flexible results in supplying an attachment having a collapsible body, which may be reduced to a compact form to be conveniently carried in the pocket for individual use.

From the foregoing description, taken in connection with the accompanying, drawings, the advantages of the eonstructionand of the method of operation will be readily apparent to those skilled in the art to which the invention appertains, and while I have described the principle of operation of the invention, together with the device which I now consider to be the embodiment thereof, I desire to have it understood that the device shown is merely illustrative, and thatisuch changes may be made when desired as are Within the scope of the claims appended hereto.

Having thus described the invention what is claimed as new, is

1. A telephone attachment ofithe character specified comprising a hollow body pro vided at one end with a mouth-piece and having its opposite end provided with a plate in which an opening is formed for receiving the telephone instrument, a collar extended forwardly from the said plate in line with the opening thereof, a flange at the forward end of said collar, and spring clips attached to the rear portion of the device for securing the same in place upon the-instrument.

2. A telephone attachment of the characopposite end to receive the instrument, and

having a plurality of small openings, in the rear portions of the shells substantially in the plane of the chambered portion receiving the instrument.

4. A telephone attachment consistingof a collapsible body provided at one end of the mouth-piece and adapted to have its opposite end receive the instrument, a spring normally exerting a force to hold the body extended, and means for holding the body collapsed agai'nst the tension of said spring.

In testimony whereof I affix my signature in presence of two Witnesses.

- FRED W. COOK. itnesses a C. A. LAUD,

' nHARLES A. KlrzMILLnn.

portions of the device when- 

